单项选择题

There is ______ "s" in the word "sense".

A．a
B．/
C．an
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单项选择题
Mike hit ______ and he fell down on the ground.
A．Tom on the head
B．on Tom's head
C．at Tom's head
单项选择题
Getting up earlier is good ______ your health.
A．to
B．at
C．for
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